Locks for sliding closure members



June 26, 1956 A. NAVARRETE LOCKS FOR SLIDING CLOSURE MEMBERS 2 Sheets-Sheet 1 Filed March 26, 1951 R Y m m m V m n r I m m w a mug June 26, 1956 A. NAVARRETE 2,752,445

LOCKS FOR SLIDING CLOSURE MEMBERS Filed March 26, 1951 2 Sheets-Sheet 2 mum W pl &

INVENTOR flgjel ign/zrrz(MammalJ RQEY ATTO

United States PatentO LOCKS FOR SLIDING CLOSURE MEMBERS Angel Navarrete, Santiago de Chile, Chile Application March 26, 1951, Serial No. 217,621

Claims priority, application Spain March 31, 1950 7 Claims. (Cl. 200-61.68)

This invention relates to improvements in locks for sliding closure members, such as Venetian blinds, sliding shutters and the like.

An object of the invention is to provide an improved locking mechanism for a sliding closure structure. A further object is to provide such a locking mechanism which locks the closure member so as to increase the security of the closure.

Another object is to provide, in connection with an improved locking mechanism, an electrical alarm system which will indicate any attempt to break or open the closure.

The foregoing and other objects of the invention are attained by providing an elongated housing which is adapted for attachment to the closure member along one edge thereof. This casing supports two bolts, one of which cooperates with a hasp mounted at the end of the frame which encloses the opening. The other bolt cooperates with a hasp mounted on the side of the opening frame. Each bolt carries a rack and both racks cooperate with a pinion which is actuated by a cylinder lock of conventional type.

Inside the casing there is provided an electric switch which is actuated in accordance with the position of one of thebolts. Another electric switch is mounted on the side hasp and is actuated in accordance with the position of the closure member itself. These two switches cooperate to control an electrical alarm or signal system.

Other objects and advantages of the invention will become apparent from consideration of the appended specification, claims and drawings, in which Fig. 1 is a view, partly in elevation and partly in section, of an improved lock mechanism embodying the invention, with the parts in their locked positions in an 1 opening, but with the closure member and certain other parts omitted for the sake of clarity.

Fig. 2 is an elevational view of an inside of a closure member embodying the invention, with the closure member partly open.

Fig. 3 is a sectional view taken along the line 3-3 of Fig. 1 looking in the direction of the arrows.

Fig. 4 is a wiring diagram of the electric alarm circuits.

Fig. 5 is an outside elevational view of a closure member provided with a lock mechanism constructed in accordance with the invention, showing the member closed.

Fig. 6 is a sectional view taken on the line 6-6 of Fig. 1, looking in the direction of the arrows.

Fig. 7 is a view taken along the line 7-7 of Fig. 5,

looking in the direction of the arrows, and on a some- In the other compartment are two racks 7 and 8, re-

2,752,445 Patented June 26, 1956 spectively attached to the bolts 3 and 4 by means of machine screws 9' which'extend through the windows 5 and 6. These racks cooperate with a pinion 10 having a cen ter slot 11 to. receive a key 12 (see Fig. 7) inserted in a cylinder lock 13.

Mounted on the wall 2 is .an insulating plate 14, which carries a pair of cooperating electric contacts 15 and 16. There is attached to the'rack' 7 a switch actuating plate 17, also'of insulating materiaL'and having a tapered lower edge. The contact'15 is self-biased'to engage the con- .tact 16. The switch actuating plate 17 engages the contact 15 as the bolt' 3 is moved to its locked position, and pushes the contact '15 out of engagement with the contact 16. The contacts 15 and 16 are respectively connected by wires 18 and 19-to electric connector fingers 20 and 21, (seeFigj 2) which are mounted on an insulating block 22 attached toa shutter or closure member 23 which carries the casing 1.

The bolt 3 cooperates with a hasp 24 mounted on the side frame'25 of the opening in which the shutter 23 moves. The bolt 4 cooperates with a hasp 26 mounted in the end frame 27 of that opening.

The hasp 24 is attached to the frame by means of screws 28. It is provided in its under surface with a pair of recesses 29 and 30 for receiving insulating blocks 31 and 32 which enclose electrical connectors 33 and 34. The connectors 33 and li t-respectively cooperate with the con-- nectors 20 and 21, previously described, when the closure member 23 is in its closed position. The connector 33 is electricallyconnected to a wire 35, while connector 34 is'electrically connected to a wire 36. The connector 33 also serves as a switch finger, being self-biased to engage anotherfinger 37. W-hen it is engaged by the connector 20, it is forced out of engagement with the other switch finger '37, which is electricallyconnected to a wire 33.

The hasp 26 '(Figs. 1 and 6) is slidable within a casing 39 which is embedded in'the frame 27. In its sliding movement, the hasp 26 is guided by a rod 40, anchored at its lower end by means of prongs 41. A spring 42 biases the hasp outwardly to its locking position, shown in the drawings. A pivoted latch 43 is provided for holding hasp, as shown in Figs. 1 and 6. When the hasp 26 is retracted within the casing 39, the latch 43 may be moved over the end of the hasp. The hasp may be provided with a finger recess 26b to aid in pulling it out to its locking position, in case'the spring 42 is not completely effective for that purpose.

The ends of the casing lare provided with flanges 44, apertured to'receive bolts 45, by which the flanges are at- 'tached to-the closure member 23. The bolts 45 are each provided with a first threaded section 45a (Fig. 7), which is threadedly received in an. aperture provided in the closure member.23. '.The bolts 45 are also provided with a threaded section 45b of smaller diameter and threaded in the opposite direction to the section 45a. For example, it"the section 45a has a righthand thread, then the section 45b has a left hand thread. The section 457 receives a nut 46. A spacer plate or washer 47 lies between the innersurface of 'n'ut'46 and the closure member 23. I t may be seen that with this construction of the bolt and nut, if an attempt is made'to turn 'the bolt 45 from the outside, itwill be tightened, regardless of the direction in which the bolt is'tu'rned. 1 If the bolt is turned to the right, then the The hasp 24 is provided with a projecting tongue 48, which extends within the frame 25. This tongue 48 lies adjacent the sides of the edges of the closure member where the latter are lubricated to slide within guides provided in the frame. Some of thelubricant on the closure member will be scraped off into a groove 48a provided in the tongue 48, and will pass through holes 48b in the hasp 24 to the recess 24a which receives the bolt 3.

When it is desired to close and lock the opening in which the shutter or closure member 23 is located, the shutter is closed and the pinion is then rotated by the key 12 to drive the bolts 3 and 4 to the positions shown in Fig. l. The hasp 26 must first of course be moved to its locking position as shown. When the shutter 23 is closed, the connector 20 engages connector 33 and forces it out of engagement with switch finger 37, thereby opening a signal circuit which may be traced (Fig. 4) from the upper terminal of a source of electrical energy, shown as a battery 49 through wire 35, switch fingers 33 and 37, wire 38, signal 50 and switch 53 back to the lower terminal of battery 49.

When the bolts are moved to their locked positions by the key, the switch actuating plate 17 engages contact and moves it out of engagement with contact 16, thereby opening a second signal circuit which may be traced from the upper terminal of the battery 49 through wire 35, connectors 33 and 20, wire 18, contacts 15 and 16, wire 19, connectors 21 and 34, wire 36, signal 52, switch 53 and thence through wire 51 to the lower terminal of battery 49. The manual switch 53 is provided for opening the signal or alarm circuits when the closure is open. When the closure is closed and locked, and the switch 53 is closed, then any attempt to slide the bolt 3 back to its unlocked position will actuate the signal 52. Similarly, any attempt to raise the shutter or closure 23 will cause actuation of the signal 50. While the signals 50 and 52 have been indicated as lamps, it will be readily understood that any suitable audible or other sensible signal or alarm may be used.

I claim:

1. A lock for a sliding closure or the like as defined in claim 6, including an electric switch located in said other chamber and movable between first and second circuitcontrolling positions, and switch operating means attached to one of said bolts for concurrent movement therewith, said switch operating means being eifective to operate said switch to its first circuit-controlling position when said one bolt is projected from the casing and to its second circuit-controlling position as said one bolt is retracted into the casing.

2. In a lock for a sliding closure or the like, a casing attached to the closure, a bolt movable in the casing between a retracted position and a projected position wherein it extends out through an end of the casing, a hasp for receiving said bolt, a support for said hasp, and electric switch means mounted on said hasp and operated by movement of the closure relative to said support, a second electric switch means mounted in said casing and operated only by movement of the bolt relative thereto, and an associated alarm means operated by actuation of either said switch means due to opening of the closure or retraction of the bolt respectively.

3. A lockable closure for an opening, comprising a frame for said opening, a closure member slidable across said opening toward and away from one end of the opening frame, one edge of said closure member abutting said one frame end when the opening is closed, an elongated casing attached to and extending partly across said closure member, said casing extending parallel to said one edge of said closure member, a pair of bolts movable within the casing and through the opposite ends thereof, means in said casing for simultaneously actuating said bolts either to project or retract both bolts, means including a removable key for operating said actuating means, a first hasp mounted on one side of said frame for receiving one of said bolts, and a second hasp mounted on said one end of the opening frame for receiving the other bolt.

4. A lockable closure as defined in claim 3, comprising an electric switch in said casing, means for actuating said switch attached to one of said bolts for concurrent movement therewith, an electric circuit controlled by said switch including a first pair of electric connectors mounted on said closure member, and a second pair of electric connectors mounted on said first hasp so as to engage respectively said first pair of connectors when said opening is closed.

5. A lockable closure as defined in claim 4, comprising a second electric switch mounted on said first hasp, means on said closure member for actuating said second switch in accordance with the position of the closure member, and an electric circuit controlled by said second switch.

6. In a lock for a sliding closure or the like, an elongated casing adapted for attachment to one edge of the closure, a longitudinal wall which divides said casing into two chambers coextensive with said casing and each other, a pair of bolts movable within one chamber and through the opposite ends thereof, said wall having two elongated openings therein adjacent said bolts, a pair of racks in the other of said chambers and adjacent said openings, fastening means extending through said opening and attaching said racks to the respective bolts, said racks facing each other, a pinion in said other chamber engaging both said racks and a removable key for rotating said pinion to drive said bolts in opposite directions.

7. In a lock for a sliding closure slidably mounted in a pair of side frames between a top and bottom sill, a casing adapted for attachment to but shorter than one edge of the closure, a pair of bolts movable within said casing and through the opposite ends thereof, means in said casing for simultaneously actuating said bolts either to project or to retract both said bolts relative to said casing, means including a removable key for operating said actuating means, a first hasp for receiving one of said bolts, said first hasp being mounted on one of said side frames and a second hasp for receiving the other of said bolts, said second hasp being mounted on one of said sills.

References Cited in the file of this patent UNITED STATES PATENTS 78,449 Gibbs June 2, 1868 684,080 Mix Oct. 8, 1901 800,648 Higinbotham Oct. 3, 1905 880,167 Shannon et al Feb. 25, 1908 932,383 Furman et al Aug. 24, 1909 956,580 Howard May 3, 1910 1,131,278 Skinner Mar. 9, 1915 1,159,586 Ihlder Nov. 9, 1916 1,700,129 Hausmann Jan. 29, 1929 1,723,956 Scheuerman Aug. 6, 1929 FOREIGN PATENTS 60,449 Netherlands Jan. 15, 1948 77,088 Switzerland Mar. 1, 1918 128,010 Germany Feb. 8,1902 351,929 Germany Apr. 19, 1922 585,442 Great Britain Feb. 6, 1947 

